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Development of Gold Nanoparticle-Based SERS Substrates on TiO2-Coating to Reduce the Coffee Ring Effect

  • Hydrophilic surface-enhanced Raman spectroscopy (SERS) substrates were prepared by a combination of TiO2-coatings of aluminium plates through a direct titanium tetraisopropoxide (TTIP) coating and drop coated by synthesised gold nanoparticles (AuNPs). Differences between the wettability of the untreated substrates, the slowly dried Ti(OH)4 substrates and calcinated as well as plasma treated TiO2 substrates were analysed by water contact angle (WCA) measurements. The hydrophilic behaviour of the developed substrates helped to improve the distribution of the AuNPs, which reflects in overall higher lateral SERS enhancement. Surface enhancement of the substrates was tested with target molecule rhodamine 6G (R6G) and a fibre-coupled 638 nm Raman spectrometer. Additionally, the morphology of the substrates was characterised using scanning electron microscopy (SEM) and Raman microscopy. The studies showed a reduced influence of the coffee ring effect on the particle distribution, resulting in a more broadly distributed edge region, which increased the spatial reproducibility of the measured SERS signal in the surface-enhanced Raman mapping measurements on mm scale.

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Document Type:Article
Author:René Breuch, Daniel Klein, Cassandra Moers, Eleni Siefke, Claudia Wickleder, Peter Kaul
Parent Title (English):Nanomaterials
Article Number:860
Number of pages:16
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2022/03/03
Copyright:© 2022 by the authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution.
Funding:This work was funded by the Food Pro.tec.ts–project, which is supported by the INTERREG Va program Deutschland-Nederland (INTERREG Va, 113071, 07/17 – 06/20). The APC was funded by the Graduate Institute of the University of Applied Science Bonn-Rhein-Sieg and the Institute of Safety and Security Research.
Keyword:AuNPs; Raman spectroscopy; SERS; TiO2-coatings; coffee ring effect
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Institut für Sicherheitsforschung (ISF)
Projects:Food Pro·tec·ts - Food production technologies for trans-boundary systems (INTERREG Va/113071)
Dewey Decimal Classification (DDC):6 Technik, Medizin, angewandte Wissenschaften / 66 Chemische Verfahrenstechnik / 664 Lebensmitteltechnologie
Open access funding:Hochschule Bonn-Rhein-Sieg / Graduierteninstitut
Entry in this database:2022/03/09
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International